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From: "Matthias Grob" <matthias@grob.org> > I also had a look at those devices, thank you, Dennis. You're welcome! > ... so I would rather need distance metering > in the 2-20cm range to measure knee, elbow and head positions, > maybe... > did you find such, too? No, I did not. 2-20 cm is not very much. It's probably too small for sonar techniques (affordable techniques) to work reliably. I know we've mentioned the I-Cube system before ( http://www.infusionsystems.com/ ). Have you ever tried one? I've wanted to for some time but never have. After the initial cost, addition sensors seems quite reasonable. Dennis Leas ------------------- dennis@mdbs.com